Tokoro Hiroko, Namai Asuka, Ohkoshi Shin-Ichi
Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Dalton Trans. 2021 Jan 19;50(2):452-459. doi: 10.1039/d0dt03460f.
Iron oxide magnets, which are composed of the common elements iron and oxygen, are called ferrite magnets. They have diverse applications because they are chemically stable and inexpensive. Epsilon-iron oxide (ε-Fe2O3) is a polymorph that shows an extremely large coercive field as a magnetic oxide. It maintains its ferromagnetic ordering even when downsized to a single nano-sized scale (i.e.,<10 nm). Due to these characteristics, ε-Fe2O3 is highly expected to be used for high-density magnetic recording media in the big data era. Here, we describe the recent developments of magnetic films composed of metal-substituted ε-iron oxide, ε-MxFe2-xO3 (M: substitution metal), toward the next-generation of magnetic media.
由常见元素铁和氧组成的氧化铁磁体被称为铁氧体磁体。它们具有多种应用，因为它们化学性质稳定且价格低廉。ε - 氧化铁（ε - Fe₂O₃）是一种多晶型物，作为磁性氧化物表现出极大的矫顽场。即使缩小到单个纳米尺寸（即<10 nm），它仍能保持其铁磁有序性。由于这些特性，ε - Fe₂O₃在大数据时代被高度期望用于高密度磁记录介质。在此，我们描述了由金属取代的ε - 氧化铁ε - MₓFe₂₋ₓO₃（M：取代金属）组成的磁性薄膜在下一代磁性介质方面的最新进展。
